I am a beginner. I have only brewed 7 times. I am brewing a Sierra Nevada Pale Ale extract clone. My OG was supposed to be 1.051 but it ended up being 1.044. My final gravity is supposed to be around 1.013. I am using White Labs WLP007. I made a starter using a stir plate. The brew fermented strong for 5 days and it mellowed out until fermentation "completed" by day 7, or so I thought. I am at day 15 and had just finished cleaning up all my bottles when I heard the familiar bubbling up sound. I could not believe my ears. Fermentation started up again! It is bubbling 15 seconds apart. I took a gravity reading and it is giving me 1.006. I have not opened it since it started fermenting. I really don't understand what is going on here. The beer tasted really nice too. I put my bottles away and will wait it out but what can be the reason for this? any experiences with a similar situation?
Thanks.
Thanks.